PMID- 31527313 OWN - NLM STAT- MEDLINE DCOM- 20201015 LR - 20231213 IS - 2379-3708 (Electronic) IS - 2379-3708 (Linking) VI - 4 IP - 20 DP - 2019 Oct 17 TI - CD83 orchestrates immunity toward self and non-self in dendritic cells. LID - 126246 [pii] LID - 10.1172/jci.insight.126246 [doi] LID - e126246 AB - Dendritic cells (DCs) are crucial to balance protective immunity and autoimmune inflammatory processes. Expression of CD83 is a well-established marker for mature DCs, although its physiological role is still not completely understood. Using a DC-specific CD83-conditional KO (CD83DeltaDC) mouse, we provide new insights into the function of CD83 within this cell type. Interestingly, CD83-deficient DCs produced drastically increased IL-2 levels and displayed higher expression of the costimulatory molecules CD25 and OX40L, which causes superior induction of antigen-specific T cell responses and compromises Treg suppressive functions. This also directly translates into accelerated immune responses in vivo. Upon Salmonella typhimurium and Listeria monocytogenes infection, CD83DeltaDC mice cleared both pathogens more efficiently, and CD83-deficient DCs expressed increased IL-12 levels after bacterial encounter. Using the experimental autoimmune encephalomyelitis model, autoimmune inflammation was dramatically aggravated in CD83DeltaDC mice while resolution of inflammation was strongly reduced. This phenotype was associated with increased cell influx into the CNS accompanied by elevated Th17 cell numbers. Concomitantly, CD83DeltaDC mice had reduced Treg numbers in peripheral lymphoid organs. In summary, we show that CD83 ablation on DCs results in enhanced immune responses by dysregulating tolerance mechanisms and thereby impairing resolution of inflammation, which also demonstrates high clinical relevance. FAU - Wild, Andreas B AU - Wild AB AD - Department of Immune Modulation and. FAU - Krzyzak, Lena AU - Krzyzak L AD - Department of Immune Modulation and. FAU - Peckert, Katrin AU - Peckert K AD - Department of Immune Modulation and. FAU - Stich, Lena AU - Stich L AD - Department of Immune Modulation and. FAU - Kuhnt, Christine AU - Kuhnt C AD - Department of Immune Modulation and. FAU - Butterhof, Alina AU - Butterhof A AD - Department of Immune Modulation and. FAU - Seitz, Christine AU - Seitz C AD - Department of Immune Modulation and. FAU - Mattner, Jochen AU - Mattner J AD - Institute of Microbiology - Clinical Microbiology, Immunology and Hygiene, Universitatsklinikum Erlangen and Friedrich-Alexander Universitat Erlangen-Nurnberg, Erlangen, Germany. FAU - Gruner, Niklas AU - Gruner N AD - Institute of Microbiology - Clinical Microbiology, Immunology and Hygiene, Universitatsklinikum Erlangen and Friedrich-Alexander Universitat Erlangen-Nurnberg, Erlangen, Germany. FAU - Gansbauer, Maximilian AU - Gansbauer M AD - Institute of Microbiology - Clinical Microbiology, Immunology and Hygiene, Universitatsklinikum Erlangen and Friedrich-Alexander Universitat Erlangen-Nurnberg, Erlangen, Germany. FAU - Purtak, Martin AU - Purtak M AD - Institute of Microbiology - Clinical Microbiology, Immunology and Hygiene, Universitatsklinikum Erlangen and Friedrich-Alexander Universitat Erlangen-Nurnberg, Erlangen, Germany. FAU - Soulat, Didier AU - Soulat D AD - Institute of Microbiology - Clinical Microbiology, Immunology and Hygiene, Universitatsklinikum Erlangen and Friedrich-Alexander Universitat Erlangen-Nurnberg, Erlangen, Germany. FAU - Winkler, Thomas H AU - Winkler TH AD - Division of Genetics, Department of Biology, Friedrich-Alexander Universitat Erlangen-Nurnberg, Erlangen, Germany. FAU - Nitschke, Lars AU - Nitschke L AD - Division of Genetics, Department of Biology, Friedrich-Alexander Universitat Erlangen-Nurnberg, Erlangen, Germany. FAU - Zinser, Elisabeth AU - Zinser E AD - Department of Immune Modulation and. FAU - Steinkasserer, Alexander AU - Steinkasserer A AD - Department of Immune Modulation and. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20191017 PL - United States TA - JCI Insight JT - JCI insight JID - 101676073 RN - 0 (Antigens, CD) RN - 0 (Immunoglobulins) RN - 0 (Membrane Glycoproteins) SB - IM MH - Animals MH - Antigens, CD/genetics/*metabolism MH - Brain/immunology/pathology MH - Cells, Cultured MH - Coculture Techniques MH - Dendritic Cells/*immunology/metabolism MH - Encephalomyelitis, Autoimmune, Experimental/*immunology/pathology MH - Female MH - Humans MH - Immune Tolerance MH - Immunoglobulins/genetics/*metabolism MH - Listeria monocytogenes/immunology MH - Listeriosis/*immunology/microbiology MH - Membrane Glycoproteins/genetics/*metabolism MH - Mice MH - Mice, Knockout MH - Primary Cell Culture MH - Salmonella Infections/*immunology/microbiology MH - Salmonella typhimurium/immunology MH - T-Lymphocytes, Regulatory/immunology MH - Th17 Cells/immunology MH - CD83 Antigen PMC - PMC6824307 OTO - NOTNLM OT - Autoimmune diseases OT - Autoimmunity OT - Dendritic cells OT - Inflammation OT - Tolerance COIS- Conflict of interest: The authors have declared that no conflict of interest exists. EDAT- 2019/09/19 06:00 MHDA- 2020/10/21 06:00 PMCR- 2019/10/17 CRDT- 2019/09/19 06:00 PHST- 2018/11/16 00:00 [received] PHST- 2019/09/04 00:00 [accepted] PHST- 2019/09/19 06:00 [pubmed] PHST- 2020/10/21 06:00 [medline] PHST- 2019/09/19 06:00 [entrez] PHST- 2019/10/17 00:00 [pmc-release] AID - 126246 [pii] AID - 10.1172/jci.insight.126246 [doi] PST - epublish SO - JCI Insight. 2019 Oct 17;4(20):e126246. doi: 10.1172/jci.insight.126246.